Swap Two Integers without the third one: the xor way. Red
Swap Two Integers without the third one: the xor way. Green
Merge branch 'master' of https://github.com/ffbit/just-for-fun
RomanNumeralsTest: moved switch to a separate method.
RomanNumeralsTest: all tests are green.
RomanNumeralsTest: little refactoring. all tests are green.
RomanNumeralsTest: optimized implementation.
RomanNumeralsTest: added a test case with a wrong roman number. Methods renaming.